Chemistry - June 2011

17 In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the

(1) activation energy    (3) heat of reaction
(2) kinetic energy         (4) rate of reaction

18 For a given chemical reaction, the addition of a catalyst provides a different reaction pathway that

(1) decreases the reaction rate and has a higher activation energy
(2) decreases the reaction rate and has a lower activation energy
(3) increases the reaction rate and has a higher activation energy
(4) increases the reaction rate and has a lower activation energy

19 Which atoms can bond with each other to form chains, rings, or networks?

(1) carbon atoms         (3) oxygen atoms
(2) hydrogen atoms     (4) nitrogen atoms

20 A molecule of an unsaturated hydrocarbon must have

(1) at least one single carbon-carbon bond
(2) at least one multiple carbon-carbon bond
(3) two or more single carbon-carbon bonds
(4) two or more multiple carbon-carbon bonds

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